Overshot



Jan. 15 1924.

1,480,815 K. E. BYNUM OVERSHOT Fild Aug. 31; 1921 FIG. 1.

INVENTOR K E. Bnvum BY MM Vlflm M ATTORNEY.

Federated Jan. 15, 1924.

KING E. BYNUM, OF FELLOWS, CALIFORNIA.

ovnnsno'r.

Application filed August 31, 1921. Serial No. 497,344.

To all whom it may concern:

Be it known that 1, KING E. BYNUM, a citizen of the United States, residing at Fellows, in the county of Kern and State of California, have invented new and useful Improvements in Overshots, of which the following is a specification.

This invention relates to overshots and has for its object to provide a very simple, novel and durable means by which a lost or broken pipe in a well hole may be readily gotten hold of. More specifically tne object of the invention is to provide a tool of this character that has gripping members pivoted in the casing of the same that can be readily and cheaply replaced when the same becomes worn or when different sized pipes are to be fished "for.

Other objects and advantages will be seen from the following description of the accompanying drawing in which:

1 is a central longitudinal section taken so as to show gripping members pivoted to the casing.

Fig. 2 is a horizontal section taken on the line 2-2 of Fig. l.

Fig. 3 is a plan view of the gripping members alone.

Fig. 4 is a side elevation of the gripping members partly broken away and taken on the line 4-4 of Fig. 3.

In my improved overshot construction I employ the usual casing 1 having an axial bore 2 and the usual bell-shaped guide memher 3 screw-threaded into the lower end of the bore 2. .An enlarged bore 4 is formed in the upper part of the casing 1 so as to form a shoulder 5. Screw threaded into the bore 4 is the usual couplingmember 6 adapted to receive the string of casing (not shown) for letting the overshot down into the well.

My improved gripping means comprises two semi-circular gripping members 7 to gether forming a sleeve adapted to have engagement with the lost pipe 8. The inner surface of the gripping members have gripping teeth 9 adapted to have operative en gagement when the same is pulled in one direction, with the pipe 8. Positioned on the lower end of the gripping members are radially extending lugs 10 adapted to be received in diametrically opposed openings 11 in the walls of the casing l and positioned above the shoulder 53. The lugs 10 and oasing 1 have holes 12 and 13 to. receive a supporting rod 14: upon which the gripping members will pivot.

To allow the gripping members to be normally inclined towards the axis of the casing the ends 15 or" the gripping members are cut away to form a longitudinal opening 16 which will allow the gripping members to be inclined.

In the operation of the device the overshot would be let down over the pi e 8 and the gripping members being pivote at their lower ends would allow the pipe to pass the same and when the overshot is pulled upward the teeth on the gripping members which would be lying against the surface of the pipe would be caused to bite into and grip the same and the lower edge of the gripping members would engage the shoulder 5 so that the weight of the pipe would not be supportedby the relatively small rod 14.

In the drawing I have shown two gripping members but it will be understood that any number could be employed without departing from the principle of the invention. Various changes may be made without departing from the spirit of my invention.

What is claimed is:

An overshot comprising a casing, having openings therein, concave gripping members provided with extensions arranged in said.

openings, pins extending through the openings and engaging said extensions for pivotally supporting the gripping members within the casing, teeth formed on the confronting faces of the gripping members, and a shoulder formed interiorly of the casing at a point between the inner surface of the cas ing and said pins whereby said gripping members are caused to normally occupy inclined positions and to engage said shoulders when in gripping position.

In testimony whereof I have signed my name to this specification.

KING E. BYNUM. 

